Why left outer join with a table gives me more lines?

Hi gurus,

I can see "view_a" and a table 'table_a '.

view_a a county of 100 lines. Now, when I left outer join that discovers with a 'table_a', I expect all 100 lines.

However, I'm more than 100 lines. Is it still possible?

Also even to analyze these situations, how can I move forward?

Because it is very high volumn of sight and takes longer to run.

Select count (*) view_a, view_b

where view_a.col1 = view_b.col1 (+)

and view_a.col2 = view_b.col2 (+);

Thank you

I can see "view_a" and a table 'table_a '.

view_a a county of 100 lines. Now, when I left outer join that discovers with a 'table_a', I expect all 100 lines.

However, I'm more than 100 lines. Is it still possible?

Also even to analyze these situations, how can I move forward?

Because it is very high volumn of sight and takes longer to run.

Select count (*) view_a, view_b

where view_a.col1 = view_b.col1 (+)

and view_a.col2 = view_b.col2 (+);

Which is not necessarily related to the use of an outer join.

Just join of two tables in general will give you more rows of one table has.

Scott DEPT table contains ONE row for deptno = 10

The EMP table has THREE rows of deptno = 10

The number of rows you plan if you join two tables using an equi-join?

Three - what is MORE lines the DEPT table has for deptno = 10

Select * from Department where deptno = 10

DEPTNO, DNAME, LOC
10, ACCOUNTING, NEW YORK

Select * from emp where deptno = 10

MGR, EMPLOYMENT ENAME, EMPNO, HIREDATE, SAL, COMM, DEPTNO
7782, CLARK, MANAGER, 7839, 6/9/1981,2450, 10
7839, KING, PRESIDENT, 17 NOVEMBER 00, 10
7934, MILLER, CLERK, 7782, 23 JANUARY 00: 10

Select dept.*, emp.*
Department, emp
where dept.deptno = 10
and dept.deptno = emp.deptno

DEPTNO, DNAME, LOC, EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM, DEPTNO_1
10, ACCOUNTING, NEW YORK, 7782, CLARK, MANAGER, 7839, 6/9/1981,2450, 10
10, ACCOUNTING, NEW YORK, 7839, KING, PRESIDENT, 17 NOVEMBER 00, 10
10, ACCOUNTING, NEW YORK, 7934, MILLER, CLERK, 7782, 23 JANUARY 00: 10

So if these are the lines ONLY in the table EMP and DEPT the query would give you THREE lines despite the DEPT table only ONE line.

No do you expect? You get ALL the child rows that belong to the parent company. Otherwise, how could it possibly work?

The OUTER join includes lines where the parent row exists but there is NO child line as others have shown.

Outer joins

Outer join extends the result of a simple join. Outer join returns all rows that satisfy the join condition and also returns some or all rows in a table for which no line of the other meet the join condition.

Get more lines to exist in one of the paintings is a basic necessity. It usually has NOTHING to with the question of whether you have an outside to join or not.

See the section on the JOINTS in the Oracle documentation

http://docs.Oracle.com/CD/B28359_01/server.111/b28286/queries006.htm

Tags: Database

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112B         1100               
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112B           1100                 1000                      7               
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    Published by: user11197113 on May 25, 2009 03:31

    Published by: user11197113 on May 25, 2009 03:32

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    Edit

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---- ---- ---- --------------
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112B 1100 1000              7
113C 1100 1000              3
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Smith            John      HOME        Rue Henry M1V 4F4  CANADA      null              null             null
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  8  g00.grpid = m00.grpid
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 10  m00.eff_dt < sysdate
 11  AND
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 14  g00.grpid
 15  /

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A          4
B          4
C          2

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  3  count(m00.grpid) mbr_count
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  8  g00.grpid = m00.grpid
  9  AND
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 11  AND
 12  m00.exp_dt > sysdate
 13  GROUP BY
 14  g00.grpid;

G  MBR_COUNT
- ----------
D          0
A          4
B          4
C          2

SQL>

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